Around one in 20 kids and one in every 100 adults will be affected by a stutter, also known as a stammer

Dr Peterson said the study, published in the journal Human Brain Mapping, provides scientists with a completely new window into the brain.

The study’s first author, Dr Jay Desai said: “When other portions of the brain circuit related to speech were also affected according to our blood flow measurements, we saw more severe stuttering in both children and adults.

“Blood flow was inversely correlated to the degree of stuttering – the more severe the stuttering, the less blood flow to this part of the brain.

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